I have GERD too. I remember reading one person's story with GERD, where they found it helpful not taking fluid during meals, but between them. This was so their stomach acid would not be diluted further during meals. I wondered how much fluid you consumed during your meals(?). I need to get back to taking most fluids between meals. I also read in Mayo Clinic patient information, one must sit properly in a chair after meals too, not raising your knees above your abdomen & go curling up afterward.
If you haven't already, it may help you to read some Mayo Clinic patient information or whatever your healthcare providers furnish you about your procedures. I have read that learning about procedures can actually reduce anxiety. I have found this to be the case for myself.

I have never forgotten a Respiratory Therapist walking in their patient's room during a foley catheter procedure. They ducked out of the room saying it sent "shivers up their spine". Yet he had no problem working with tubes in the upper airway, or around adjacent feeding tubes, etc. Many of us have our callings, Urology was not his! Good for you for working with your doctors to get to the bottom of things.